Higashi no Eden/Eden of the East.
link It's in both sub and I believe dub, too. There's 1 或者 2 电影院 that go along with it as well. I can't remember, though, since it's been a while since I last watched it.
Genre: Action, Comedy, Mystery, Drama, Romance, Sci-Fi, Josei
Episodes: 11
Type: TV Series
Age Rating: Teen +17
There's also Welcome to the NHK. It doesn't say it in the genre, but it can be kinda ecchi-ish here and there, but not to the point where it's overbearingly annoying.
link Genre: Comedy, Romance, Slice of Life, Psychological
Episodes: 24
Type: TV Series
Age Rating: Teen +17
太空 Brothers isn't exactly romantic, but 你 can tell that the main characters has feelings for this one girl and he'll often blush and whatnot and so will she. 你 know, like 日本动漫 characters do. It also doesn't say there's comedy, but I for, find scenes here and there to be funny.
I still have yet to finish it, though, since it, is, 或者 rather, was, ongoing. There's around 20 或者 less episodes I stopped watching for a while there since I got tired of waiting each week.
link Genre: Sci-Fi, Space, Slice of Life, Seinen
Episodes: Unknown
Type: TV Series
Manga: Read Uchuu Kyoudai 日本漫画 Online
Age Rating: Everyone
Sorry if none of these are what 你 were looking for, 或者 if you've already seen them, but hopefully someone will be interested, and if not, oh well then. xD